package com.nowcoder.community.controller.interceptor;

import com.nowcoder.community.entity.LoginTicket;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.service.UserService;
import com.nowcoder.community.util.CookieUtil;
import com.nowcoder.community.util.HostHolder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContext;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.context.SecurityContextImpl;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Date;

/**
 * 登录Ticket认证
 * 并持有用户对象
 */
@Component
public class LoginTicketInterceptor  implements HandlerInterceptor {
    @Autowired
    private UserService userService;

    @Autowired
    private HostHolder hostHolder;

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
//      从cookie中获取凭证
        String ticket = CookieUtil.getValue(request,"ticket");
//      不为null,在数据库中查询该凭证
        if (ticket!=null){
            LoginTicket loginTicket = userService.findLoginTicket(ticket);
            if (loginTicket!=null && loginTicket.getStatus() ==0 && loginTicket.getExpired().after(new Date())){
//                获取用户
                User user = userService.findUserById(loginTicket.getUserId());
//                持有用户
                hostHolder.setUser(user);
//                构建用户认证的结果,存入SecurityContext,便于Security授权
                Authentication authentication = new UsernamePasswordAuthenticationToken(
                        user,user.getPassword(),userService.getAuthorities(user.getId()));
                SecurityContextHolder.setContext(new SecurityContextImpl(authentication));

            }
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        User user = hostHolder.getUser();
        if(user!=null && modelAndView!=null){
            modelAndView.addObject("loginUser",user);
        }
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        hostHolder.clear();
    }
}
